You can get a 1.5" hose and use a reducer at the thermostat end. Gates 26390 goes from 1.5 to 1.25, it slips inside the 1.5" hose. I've used one in the past, it has a lip to keep it from going in too far.
Jim
1935 QD 1.5 ton stake bed 1937 SD 1.5 ton stake bed 1944 MS 1.5 ton stake bed 1946 PW 2 ton stake bed
